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Abstract

Disclosed is a memory in which the internal nodes of the memory cell are connected to the gates of the read device transistors. The cell selection is carried out with a restored select line, driven by an n-type device of a word line driver. Due to the small cell load of the read device transistor gate, this approach allows the usage of dual rail sensing and is particularly suitable for multiport applications.

Country

United States

Language

English (United States)

This text was extracted from an ASCII text file.

This is the abbreviated version, containing approximately
65% of the total text.

Dense High Performance Cell for Multiport Applications

Disclosed is
a memory in which the internal nodes of the memory
cell are connected to the gates of the read device transistors. The
cell selection is carried out with a restored select line, driven by
an n-type device of a word line driver.
Due to the small cell load
of the read device transistor gate, this approach allows the usage of
dual rail sensing and is particularly suitable for multiport
applications.

Fig. 1 shows
a prior art three port cell. Here the
internal
latch (T1...T4) is single ended and is written by the wordline write
signal (WLW) and the data at the DI line.

In a read
operation, an isolation inverter (T6.T7) is required
in order to avoid cell interaction with the bitline potential. A
single ended bitline is used, i.e. the
cell inverter has to drive
either the bitline up or down requiring a power supply swing. The
data out stage is a simple inverter with pull-up device for
recovering the (VDD-Vt) bitline uplevel which is the maximum voltage
level obtained via devices T6 and T8.

In this
approach, the bitline will always be charged and
discharged by two devices in series and a full swing is required.
Thus large transistors T6...T9 are required in order to obtain good
performance. The penalty paid for these
large devices is an increase
in the cell area.

Fig. 2 shows
the disclosed memory scheme. Very small
devices
are connected with the...